head girls presentation

hi im 17 and relativly new and unexperienced at presentations, your site is very useful but i was wondering if you could give me a unique presentation idea for a presentation to my year at school about myself and my qualities to go for "head girl" or "senior prefect" i have to talk to rougly 150girls and 20staff so something attention grabing would be perfect. the presentation is in 2day so something quick would be great! any other hints?!
thanks

i would like to apply for the position of head girl at my secondary school and i have got to complete a letter of application and a presentation to deliver to the head teacher and some assistant headteachers to express why i want to be head girl, why i will be a good head girl and what i can bring to the school!! please help!!